CFLib.org – Common Function Library Project

Description:
Returns the date for Orthodox Easter (Pascha) in a given year. If no year is specified, defaults to the current year.

Return Values:
Returns a date.

Example:

<cfoutput>
    #dateFormat(getPascha(), "full")#<br>
    #dateFormat(getPascha(2010), "full")#
</cfoutput>

Parameters:

Full UDF Source:

<!---
 Returns the date for Orthodox Easter (Pascha) in a given year.
 
 @param y      Year. Defaults to the current year. (Optional)
 @return Returns a date. 
 @author John E Pusey (nightgazing@gmail.com) 
 @version 1, April 9, 2007 
--->
<cffunction name="getPascha" returntype="date">
    <cfargument name="y" type="numeric" required="false" default="#year(now())#">
    
    <cfset var t = 0>
    <cfset var dd = 0>
    <cfset var mm = 0>
    
    <cfset t = (19 * (y mod 19) + 16) mod 30>
    <cfset dd = 3 + t + (2 * (y mod 4) + 4 * (y mod 7) + 6 * t) mod 7>

    <cfif y lt 1924>
        <cfset dd = dd - 13>
    </cfif>

    <cfif dd gt 30>
        <cfset dd = dd - 30>
        <cfset mm = 5>
    <cfelse>
        <cfset mm = 4>
    </cfif>
    
    <cfif dd lt 1>
        <cfset dd = dd + 31>
        <cfset mm = 3>
    </cfif>

  <cfreturn createDate(y, mm, dd)>
</cffunction>